Hard to decide which buttons is selected on a popup.

[leoheck]

Which button is selected?

The selected tab is close to the popup to show a mismatch of the theme.

Also, buttons and tabs that are not selected should look more like the background otherwise it is hard do distinguish the selected item.

OS: Ubuntu 24.04.1 LTS (ubuntu:GNOME/ubuntu-xorg/xcb)
Architecture: x86_64
Version: 1.1.0dev.40041 (Git) Conda AppImage
Build type: Release
Branch: main
Hash: 64a4f6e3669279e5dbe9cb59d8e0123eaeb70833
Python 3.11.9, Qt 5.15.13, Coin 4.0.3, Vtk 9.2.6, OCC 7.7.2
Locale: English/United States (en_US)
Stylesheet/Theme/QtStyle: OpenDark.qss/OpenDark/Fusion
Logical/physical DPI: 96/145.143
Installed mods: 
  * Assembly4 0.50.16-dev
  * sheetmetal 0.7.5
  * Curves 0.6.54
  * InventorLoader 1.5.1
  * diff-tools 0.1.0
  * ose-piping
  * OpenTheme 2024.9.1 <======================================
  * fasteners 0.5.37
  * GDT
  * osh-autodoc-workbench 0.2.3
  * OpticsWorkbench 1.0.26
  * lattice2 1.0.0
  * kicadStepUpMod 11.5.2